Bull’s Eye from Oliver Twist

Bill Sikes’s dog, Bull’s-eye, has “faults of temper in common with his owner” and is an emblem of his owner’s character. The dog’s viciousness represents Sikes’s animal-like brutality, while Sikes’s self-destructiveness is evident in the dog’s many scars. The dog, with its willingness to harm anyone on Sikes’ whim, shows the mindless brutality of the master. Sikes himself senses that the dog is a reflection of himself and that is why he tries to drown the dog. He is really trying to run away from who he is. This is also illustrated when Sikes dies and the dog does immediately also.[15] After Sikes murders Nancy, Bull’s-eye also comes to represent Sikes’s guilt. The dog leaves bloody footprints on the floor of the room where the murder is committed. Not long after, Sikes becomes desperate to get rid of the dog, convinced that the dog’s presence will give him away. Yet, just as Sikes cannot shake off his guilt, he cannot shake off Bull’s-eye, who arrives at the house of Sikes’s demise before Sikes himself does. Bull’s-eye’s name also conjures up the image of Nancy’s eyes, which haunts Sikes until the bitter end and eventually causes him to hang himself accidentally.
From Wikipedia